At levels of output close to full employment, the aggregate supply curve is probably

If Sam is producing at a point on his production possibilities frontier, then he

A) cannot produce any more of either good. B) can produce more of one good only by producing less of the other. C) will be unable to gain from trade. D) is not subject to scarcity.

The capital-labor ratio will tend to increase over time when

A) investment per worker equals saving per worker. B) investment per worker exceeds saving per worker. C) investment per worker is less than depreciation per worker. D) saving per worker equals depreciation per worker. E) output per worker is less than capital per worker.